Bump MSRV to 1.60

Log recently did this.

.github/workflows/build.yml

@@ -57,7 +57,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.57
+          toolchain: "1.60"
 
       - run: cargo check --lib --all-features -p rustls
 

.github/workflows/connect-tests.yml

@@ -20,7 +20,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - 1.57 # MSRV
+          - "1.60" # MSRV
         os: [ubuntu-20.04]
         # but only stable on macos/windows (slower platforms)
         include:

README.md

@@ -20,6 +20,8 @@ If you'd like to help out, please see [CONTRIBUTING.md](CONTRIBUTING.md).
 
 ## Release history
 
+* Next release:
+  - Bump MSRV to 1.60 to track similar change in dependencies.
 * Release 0.21.1 (2023-05-01)
   - Remove `warn`-level logging from code paths that also return a `rustls::Error` with
     the same information.
@@ -142,7 +144,7 @@ supported by `ring`. At the time of writing this means x86, x86-64, armv7, and
 aarch64. For more information see [the supported `ring` CI
 targets](https://github.com/briansmith/ring/blob/9cc0d45f4d8521f467bb3a621e74b1535e118188/.github/workflows/ci.yml#L151-L167).
 
-Rustls requires Rust 1.57 or later.
+Rustls requires Rust 1.60 or later.
 
 # Example code
 There are two example programs which use

connect-tests/Cargo.toml

@@ -2,7 +2,7 @@
 name = "rustls-connect-tests"
 version = "0.0.1"
 edition = "2021"
-rust-version = "1.57"
+rust-version = "1.60"
 license = "Apache-2.0 OR ISC OR MIT"
 description = "Rustls connectivity based integration tests."
 publish = false
@@ -20,4 +20,4 @@ rustls = { path = "../rustls", features = [ "logging" ]}
 
 [dev-dependencies]
 regex = "1.0"
-ring = "0.16.20"
+ring = "0.16.20"

examples/Cargo.toml

@@ -2,7 +2,7 @@
 name = "rustls-examples"
 version = "0.0.1"
 edition = "2021"
-rust-version = "1.57"
+rust-version = "1.60"
 license = "Apache-2.0 OR ISC OR MIT"
 description = "Rustls example code and tests."
 publish = false

rustls/Cargo.toml

@@ -2,7 +2,7 @@
 name = "rustls"
 version = "0.21.1"
 edition = "2021"
-rust-version = "1.57"
+rust-version = "1.60"
 license = "Apache-2.0 OR ISC OR MIT"
 readme = "../README.md"
 description = "Rustls is a modern TLS library written in Rust."